Drive jar for wells



Nov. 17, 1931.

Tiql

A. c. BAIMBRIDGE 1,831,942

- DRIVE JAR FOR WELLS Filed Oct. 27. 1930 Tic E 9 '/Z 5;? 5% 22 i x v: A

INVENTOR A TTORNEYS Patented Nov. 17, 1931 UNITED STATES PATENT OFFICE DRIVE JAR FOR WELLS Application filed October 27, 1930. Serial No. 491,516.

This invention relates to a drive adapted for' insertion in a drill pipe or like string. In splitting pipe, perforating casings vibrating casing to determine frozen locations, a

6 downward drive is desirable. There are other conditions under which downward driving is desirable and which will be apparent to one familiar with oil well drilling.

The present invention has for its primary 1 object the provision .of a drive which takes advantage of weight from above such as the drill string in striking a blow downward. A further object of this invention is to provide a drive which may be trippedor released to strike a blow vy a turnin movement of the string. A fur ther object o thls invent on is the provision of a sturdy, simple drive which is compact and will not interfere with circulation.

These objects together with other obJects and corresponding accomplishments are obtained by means of the embodiment of my invention illustrated in the accompanying drawings, in which Fig. 1 is an elevation partly in section of a drive in expanded position; Fig. 2 is a View similar to Fig. 1 showing the drive in collapsed position; Figs. 3 and 4 are sectlons as seen on the lines correspondingly numbered in Fig. 1; and Fig. 5 is a section as seen on the line 55 of Fig. 2.

Referring with more particularity to the drawings, a hammer member is indicated by A and an anvil member is denoted by B. These members are telescopicalliy connected and are adapted to\be interpose in a string of drill pipe or the like between a tool and the lower portion of the drill string and serve as a slip joint. To this end the hammer member A is shown provided with a threaded box and the anvil member has a pin. In Fig. 1, a trip device is indicated generally by G and is for the purpose of holding the members in expanded position and permitting release for collap'sion to the position shown in Fig. 2.

The hammer member comprises a shell having a tubular portion 6 beveled at the lower end as indicated by 7 to provide a hammer head. At the upper end of the tubular section, a reduced portion 8 is provided with a thread to receive a cap or sub 9 which carries the threaded socket 10. Bore 11 extends through the cap and is arranged to provide for packing, indicated generally by 12. This 1 constitutes in efiect a stufling box and may be of any well known construction.

The anvil member comprises a mandrel 13 which is adapted to slide within the bore of the tubular member 6. It is enlarged at the lower end to provide an anvil 14 dished at the top to correspond to the head 7. A tapered pin 15 is provided for connection to a tool or any extension of the tool. The mandrel has a circulation passage '16 extending therethrough and is extended at the upper end as indicated by 17 which extension slides in the cap. Thus, there is a closed expansible passage through the drive, which drive also serves as a coupling.

The mandrel has a head of butterfly form comprising wings 18 adapted to slide in corresponding ways 19 in the shell. The butterfly slides for a limited distance so that in expanded position it rests by means of the wings upon the shoulders at the bottoms of the ways. The ways have offset portions .20 at the lower end so that the butterfly may be turned and the shell may be supported upon the butterfly by reason of the latter resting against the upper walls of the offsets and supporting the weight from .above. Abutments 21 prevent the wings from being passed completely along the offsets from one way to an other. The ofisets constitute keepers and the wings catches which cooperate to form a trip mechanism.

The tool is operated by setting it in the position as shown in Fig. 1. The tool is then caused to rest upon the bottom supporting the weight above as the drill string. To collapse the drive, the drill string is then turned to register wings 18 with ways 19, whereupon the drill string will drop and hammer head 7 will strike the anvil causing a blow, the force of which is determined by the weight above and the drop.

What I claim is 2- 1. The combination of a rigid operating string of considerable weight, a coupling 1 drive at the lower part of said string, and a tool below and secured to said coupling drive characterized by said drive comprising a longitudinally expansible and collapsible device including a hammer and an anvil for impact on collapsion of said device and a trip operable by manipulation of said string to hold said device expanded or to release said device for collapsion and enable said string to fall and collapse said device.

2. The combination of a rigid operating string of considerable weight,za coupling drive at the lower part of said string, and

. a tool below and secured to said coupling drive characterized by said drive comprising a longitudinally expansible and collapsible device including a hammer and an anvil for impact on collapsion of said mechanism and a rotary trip to hold said device expanded or by turning to release said mechanism for collapsion and enable said string to fall'and collapse said device.

3. The combination of a rigid operating string of considerable weight, a coupling drive at the lower part of said" string, and a tool below and secured to said coupling drive characterized by said drive comprising a hammer member and an anvil member telescopically connected for impact on collapsion of said drive and a rotary trip between said members to hold said drive expanded or to release said drive for collapsion and enable said string to fall and collapse said device.

4. In a drive jar for deep wells, a slip joint coupling mechanism adapted to be connected between a string of drill pipe and a tool, said coupling mechanism being longitudinally expansible and freely collapsible, said coupling mechanism including a cooperating hammer and anvil for impact on collapsion of said mechanism, and trip means to hold said mechanism in expanded position and upon release to enable said drill pipe to cause said mechanism to collapse and said hammer to strike said anvil.

5. In a drive ar for deep wells, a slip joint coupling mechanism adapted to be connected between a string of drill pipe and a tool, said coupling mechanism comprising a hammer member and an anvil member telescopically connected for longitudinally expansible and freely collapsible movement, and trip means to hold said mechanism in expanded position and upon release to enable said drill pipe to cause said mechanism to collapse and said hammer to strike said anvil, said trip means including a keeper on said anvil member and a catch on said hammer member.

6. In a drive jar for deep wells, a slip joint coupling mechanism adapted to be connected between a string of drill pipe and a tool, said coupling mechanism comprising a shell with a hammer portion at its lower end and a mandrel telescopically mounted in said shell with an anvil below and'in line with said hammer portion, whereby to be longitudinally expansible and freely collapsible, and trip means to hold said members in expanded position and upon release to enable said drill pipe to cause said members to colla se and said hammer to strike said anvil, sai trip means comprising a catch on said mandrel and a keeper on said shell positionable in abutting alinement with said members in expanded position and rotatable therefrom into release position to enable collapsion.

7. In a drive jar for deep wells, a slip joint coupling mechanism adapted to be connected between a string of drill pipe and a tool, said coupling mechanism comprising a shell connected to said string and having a hammer portion at its lower end telescopically mounted in said shell with an anvil below and in line with said hammer portion whereby to be longitudinally expansible and freely collapsible, and trip means to hold said members in expanded position and upon release to enable said drill pipe to cause said members to collapse and said hammer to strike said anvil, said mandrel having a butterfly catch and said shell having ways for said catch to longitudinally slide in, keeper shoulders on said shell at said ways for said catch to rest upon in expanded position of said members whereby relative turning movement of said members will position said butterfly catch to ride in said ways to collapsion posit-ion of said members.

In\ witness that I claim the foregoing I have hereunto subscribed my name this 14 day of October, 1930.

ALPHAEUS C. BAIMBRIDGE. 

